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Cummins 4BT – Front Gear Housing and Gear Train

Troubleshooting the front gear housing and gear train consists of checking for leaks at the gaskets (front cover,
timing pin assembly and fuel injection pump) and the front crankshaft lubricating oil seal, inspecting the gears and
measuring backlash when required.
Refer to Procedure 7-16 to replace the front crankshaft oil seal.

Gear noise emitted from the cover can indicate worn gear teeth.
NOTE: Excessive backlash can affect engine timing and engine performance.